Just curious as to what fire suppression AO Members use in their data centers.

Currently, I have forced water sprinklers. And a few c02 extinguishers.

Now I'm not exactly happy with water but what else is there? Insurance and building codes state there must be water, or an acceptable substitute, in all mechanical closets. That's how the date center is classified. Of course neither the insurance or city/state folks will tell me what's an acceptable substitute.